Patent GB-490638-A (GB)
Title: Improvements in locks
IPC: E05B13/00
Filed: 1937-11-02
Abstract: 490,638. Locks. BJORCK, Y. Nov. 2, 1937, No. 30009. [Class 44] A lock having the locking mechanism disposed at a lateral distance from the ordinary key-hole has means enabling the lateral displacement of the lock operating portion of the key from the inserting to the actuating position to be carried out. A lock, Fig. 1, has a spring-loaded latch bolt 3 which may be retracted by means of a cotter 16 between spaced discs 13, which in turn are rotated by a handle 9 attached to the shaft 10, and a locking bolt 4 which is kept in the shot out position against the action of a spring 8 by a plate 20 coacting with the horizontal pins 23 located in the lower part of the casing. To release the lock a separable key, Fig. 7, is used which is introduced into the key hole and turned through a right-angle. This causes the lugs 53 to enter an intermediate space between the casing wall and a fixed disc in the casing and projections on the knife edge 52 to be pushed back so as to release it from the abutment 50. In this position the shank 45 is clamped to the front casing plate, and the abutment 50 is able to be moved out laterally from the shank. The handle 9 is then depressed and the discs 13 rotated carrying with them the bit 44. The tongues 46, 47 of the bit raise the pins 23 until they are in line with the holes 21, 22 in the plate 20. The bolt 4 may then be retracted by the spring 8. A recess 32 cooperating with the bit 44 limits the amount of rotation of the discs 13 so that the pins 23 are raised to the right level. When the handle is released it returns by spring action to the horizontal position and the bit and the shank of the key may be reunited. The shooting of the bolt 4 is effected by simply depressing the handle 9, the key being withdrawn. The cotter 18 acts on the free end 43 of the plate 19 to shoot the bolt and displace the plate 20 which will release the pins 23. A screening plate 36 pivoted between the plates with the free end entering a fixed stirrup 38 shields the locking mechanism when the handle 9 is in the horizontal position and the two key-holes co-incident. Another plate 40 fixed to the discs extends from the point of suspension to the centre. The guide member 41 co-operating with the spring 39 prevents the plate 36 from fouling the pins 23 and causes it to enter the stirrup 38. Modifications of the key are described. Another form of lock, Fig. 11, consists of a latch bolt 73 operated from the handle shaft 72 and a lock bolt 74 operated by a crank-shaped key, Fig. 14. The key is inserted through the key-hole 84 with the portion 81 lying in the recess 75. The handle is then operated which causes the bolt 73 to be withdrawn, the angle-iron plate 78 to be raised and the plate 80 to move the key transversely. The key can then operate the mechanism for operating the bolt 74. In this lock the mechanism is shielded from the keyhole 84 by the angle iron 78 and when this is withdrawn the plate 80 covers a port of the key-hole. A padlock also operated by a crankshaped key is shown in Fig. 19. In this case the locking mechanism K is shielded from the key-hole by a plate 108 pivoted on the side of a slidable box 104. The key is inserted as before and the box slid to the left. The pin 110 opens the plate 108 and allows the key to operate the mechanism K. A further safety device is a bolt 123 which when the box 104 is moved to the left enters the locking mechanism to lock it. The bolt 123 may be withdrawn by an additional bit on the key.